"*M.Sc. Project on Kenya's Domestic Export*.". In: *.* EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; Submitted. Abstract

"*Deletion Designs*.". In: *Journal of Science and Technology, 7, (2002), 323-332*. EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; 2002. Abstract

"*Generalization of non-singularity Conditions of Fifth Order Rotatable Designs.*". In: *Everyman's Science vol. XVII (1991).* EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; 1991. Abstract

"*A fifth Order Rotatable design in Three dimensions*.". In: *Comm., Stat., Theo. Meth., vol. A18*. EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; 1989. Abstract

"*Fifth Order Rotatability*.". In: *Comm. Stat. Theo. Meth. Vol A17, No. 3*. EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; 1987. Abstract

"*Ph.D. Thesis entitled Fifth Order Rotatable Designs submitted to the University of Nairobi*.". In: *Kenya*. EM Ngatia, LW Gathece, FG Macigo, TK Mulli, LN Mutara, EG Wagaiyu.; 1985. Abstract